Updated

• Upgraded from Purpur API 1.21.1 to Purpur API 26.1.2.build.2585-stable (latest stable)
• Updated Java source/target from 21 to 25
• Updated api-version in plugin.yml to 26.1.2

Added

• Sound support for custom commands via sound:, sound-volume:, and sound-pitch: config fields.
• Example commands (farm, heal, spawn) added to the default config.yml.

Changed
- Refactored command execution flow into smaller helper methods for maintainability.
Improved
- Safer startup: plugin now logs a clear error and disables itself if `plugin.yml` command registration is misconfigured.
- Tab completion for `/bubblecommand` now only suggests `reload` to senders who have `bubblecommand.admin`.

Added
- PlaceholderAPI placeholder support in actions/messages (optional).

Changed
- Improved dynamic command unregister compatibility on newer Paper/Purpur.